Q91.4 — Trisomy 13, nonmosaicism (meiotic nondisjunction)
Is Q91.4 billable?
Yes — Q91.4 is billable for FY2027. Q91.4 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Q91.4 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Q91.4 at a glance
| Code | Q91.4 |
|---|---|
| Description | Trisomy 13, nonmosaicism (meiotic nondisjunction) |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q91.4 group to?
Q91.4 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 884Organic Disturbances and Intellectual Disabilitymedical
As a secondary diagnosis, Q91.4 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is Q91.4 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q91.4. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Trisomy › 13 › meiotic nondisjunction (syndrome)
- Syndrome › trisomy › 13 › meiotic nondisjunction
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q91.4, but a patient may have both at the same time. When documentation supports it, Q91.4 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
Excludes2 — not included here — inherited from Q90-Q99
The conditions below are not part of Q91.4, but a patient may have both at the same time. When documentation supports it, Q91.4 and the excluded code may both be reported.
- mitochondrial metabolic disorders (E88.4-)
How long has Q91.4 existed?
Q91.4 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.